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X-Received: by 2002:a5e:8913:: with SMTP id k19mr12622488ioj.7.1545665043910; Mon, 24 Dec 2018 07:24:03 -0800 (PST) Date: Mon, 24 Dec 2018 07:24:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e259a2057dc62f0d@google.com> Subject: INFO: rcu detected stall in snd_pcm_oss_read From: syzbot To: alsa-devel@alsa-project.org, anna-maria@linutronix.de, bigeasy@linutronix.de, chanho.min@lge.com, diwic@ubuntu.com, jmiller@neverware.com, keescook@chromium.org, linux-kernel@vger.kernel.org, o-takashi@sakamocchi.jp, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 3c730b1041ae Merge branch 'fixes' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16a6cf1b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=861a3573f4e78ba1 dashboard link: https://syzkaller.appspot.com/bug?extid=fbe0496f92a0ce7b786c compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131fdcdd400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1647bf7d400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+fbe0496f92a0ce7b786c@syzkaller.appspotmail.com hrtimer: interrupt took 35234 ns audit: type=1400 audit(1545621421.464:37): avc: denied { map } for pid=6182 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (13423 ticks this GP) idle=6c6/1/0x4000000000000002 softirq=7663/7665 fqs=5214 rcu: (t=10500 jiffies g=5229 q=6) NMI backtrace for cpu 0 CPU: 0 PID: 6180 Comm: syz-executor053 Not tainted 4.20.0-rc7+ #165 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree.c:1195 print_cpu_stall.cold.65+0x1f3/0x3c6 kernel/rcu/tree.c:1334 check_cpu_stall kernel/rcu/tree.c:1408 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xac1/0x1410 kernel/rcu/tree.c:2506 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__raw_read_unlock_irq include/linux/rwlock_api_smp.h:244 [inline] RIP: 0010:_raw_read_unlock_irq+0x56/0x80 kernel/locking/spinlock.c:264 Code: 52 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 32 48 83 3d 33 94 7a 01 00 74 1f fb 66 0f 1f 44 00 00 01 00 00 00 e8 d0 c2 7d f9 65 8b 05 69 80 2a 78 85 c0 74 05 5b RSP: 0018:ffff8881be89f660 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffffff89e89e60 RCX: 1ffff11039b689cc RDX: 1ffffffff12a4030 RSI: 0000000000000000 RDI: ffffffff89520180 RBP: ffff8881be89f668 R08: ffff8881cdb44e60 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881cdb445c0 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881be89f828 __snd_pcm_stream_unlock_mode+0x125/0x150 sound/core/pcm_native.c:145 snd_pcm_stream_unlock_irq sound/core/pcm_native.c:202 [inline] snd_pcm_delay+0x234/0x380 sound/core/pcm_native.c:2698 snd_pcm_kernel_ioctl+0x1e0/0x220 sound/core/pcm_native.c:2998 snd_pcm_oss_capture_position_fixup+0x1a1/0x250 sound/core/oss/pcm_oss.c:1202 snd_pcm_oss_read3+0x181/0x410 sound/core/oss/pcm_oss.c:1271 io_capture_transfer+0x27d/0x310 sound/core/oss/io.c:73 snd_pcm_plug_read_transfer+0x1d7/0x3b0 sound/core/oss/pcm_plugin.c:651 snd_pcm_oss_read2+0x221/0x450 sound/core/oss/pcm_oss.c:1474 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1512 [inline] snd_pcm_oss_read+0x4e4/0x820 sound/core/oss/pcm_oss.c:2752 __vfs_read+0x117/0x9b0 fs/read_write.c:416 vfs_read+0x17f/0x3c0 fs/read_write.c:452 ksys_read+0x101/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443ef9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffd155a428 EFLAGS: 00000217 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443ef9 RDX: 0000000000000008 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 R10: 00000000004002e0 R11: 0000000000000217 R12: 0000000000401c00 R13: 0000000000401c90 R14: 0000000000000000 R15: 0000000000000000 sched: RT throttling activated --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches